Emergency stop for glassware making machines



Feb. 7, 1939.

Original Filed March 21, 1933 Eda/22rd fiddle/1 Patented Feb. 7, 1939;

PATENT OFFICE EMERGENCY STOP FOR GLASSWARE MAKINGJVIACHINES EdwardMiller, Columbus, Ohio, assignor to Lynch Corporation, a corporation ofIndiana Continuation of application Serial No. 661,915, March zl, 1933.This application July 3, 1935,

Serial No. 29,697

10 Claims.

The present invention relates to improvements in glassware formingmachines of the type employing fluid pressure operated devices forfabricating or handling of the ware, and aims to im- 5 prove existingmachines of that type.

Most glassware forming machines include, as a part of their mechanism,certain bodily movable elements or mechanisms, such as reciprocatingplunger mechanism, blow heads, transfer or take- -l out members and thelike. In many machines one or more of these elements or mechanism areoperated by a reciprocable fluid pressure operated motor. One of theprincipal aims and objects of the invention is the provision of a simplel and efficient safety mechanism arranged to prevent operation of themachine until such fluid pressure operated bodily movable member hascompleted its movement and has returned to a position that it will notbe jammed during'opera- 20 tion of the machine.

In the accompanying drawing, I have illustrated one application of myinvention to a glassworking machine, and for purposes of illustration Ihave shown other improvements applied to a 25 rotary machine of thepress and blow type. The drawing, therefore, is diagrammatic, partsbeing shown in plan and parts in section, better to illustrate onepreferred construction.

By way of illustration, the invention is shown 30 applied to a rotarypressing and blowing machine comprising a rotary mold carrier 9 drivenby suitablemeans, as for example, by an intermittent driving mechanism,comprising a Geneva gear III rotated by a rotor I I, suitably drivenfrom a main 35 drive shaft I2. The drive shaft advantageously mayinclude a clutch I3 operable by means of a clutch lever I4 and a brakeI5 to check the shaft and table against rotation when the clutch isdisengaged. It is to be understood that the particu- 40 lar details ofthe mold carrier driving or indexing mechanism is not essential to thebroad features of the invention, but merely illustrate one suitabledriving mechanism for the purpose.

As stated above, glassware forming machines 45 usually includemechanisms or members bodily movable toward or from the molds or otherparts of the machine, as for example; the pressing plunger, the blowingheads, transfer and take-out tongs, mold clamp and the like. It isobviously so important in the intermittently rotated machine,

that the molds not be indexed while any of these mechanisms are in thepath of the molds or other parts carried by the mold carrier, otherwisedamage to the machine may occur. Accordingly I 55 provide mechanismoperative to prevent mold carrier movement, which in the illustratedembodiment of the invention, may control the clutch I3, in the event oneof the bodily movable elements or mechanisms, as for example, thepresspunger, fails to return to its inactive position. 5

In the illustrated embodiment, the body movable member or mechanism isillustrated as a pressing plunger II, on the lower end of a rod I8,suitably connected to a piston rod I9 of a piston 20 reciproca'ble'in acylinder 2I supported upon 10 a suitable support or standard'fl from afixed part oi the machine; Air under pressure may be alternatelyadmitted to opposite ends of the cylinder2 I, as is usual, toreciprocate the plunger ll into and out of operative engagement with themold 23, as is customary and well understood. The bodily movable member,that is, the pressing plunger, in the illustrated example, carries anabutment orcam member 24, which may be mounted on some movable partthereof, as for example, the pistonrod I9, which is adapted to engage,during "operative position of the member II, an emergency safety deviceadapted during operation or working position of the member II, to renderthe mold carrier driving or in- 25 dexing mechanism inoperative. 1

One" suitable type of safety device comprises a valve" casing '26, whichmay be mounted upon a bracket 2I'supported upon the support or standard22- and provided with a reciprocatory valve stem 28 therein carrying aroller 29 at its outer end adapted to be engaged by the abutment or cammember 24. 'The valve casing 26 is bored throughout its length asat 30,to form a guide for the stem '23 and at one-end the bore is enlarged asat =3I to receive the head 32 of the valve stem 28, there beinga valveseat 33 formed where the bores 39 and 3| join. The casing-26 is providedat one sid'eoi the seat 33 with an air inlet port 3| adaptedto receive,through line 34- constant or main pressure air, and on the opposite sideof the seat there is a port 35 to which is connected air line 35,adapted to deliver, during working position oi? the =member I1, airunder pressure to a cylinder 36 to move a piston 31 therein, the pistonrod." of which is connected to the clutch lever I4 to disengage theclutch I3 and apply the brake I5, thus rendering the driving mechanismfor the mold carrier inoperative during working position of the memberII'.

Obviously as long as the several movable elements or mechanisms I'Ifunction properly and are in their inoperative positions at the time ofindexing themold carrier, there is no necessity for the repeatedunclutching and clutching of the driving mechanism. To avoid suchexcessive wear upon the clutch and driving mechanism I provide meansinterposed in the connections between the safety device and the cylinder36 which will render the piston 31 for clutching and unclutching thedrive mechanism operative only in case the element or mechanism I1 isstuck in the working position at the instant the mold carrier is to beindexed. 7

One suitable example of such means is a valve in the line 35 the inletport of said valve casing 43 being connected to the portion of the line35 connected to the valve casing 25 and the outlet port of the valvecasing 43 being connected to the cylinder 36. This valve casing 43 ispreferably fitted with a spring pressed valve 44 acting normally toclose the valve and prevent the flow of air to the cylinder 36. The stem45 of the valve 44 may extend through the casing 43 to be engaged by anabutment on a timer, as for example, a cam 46 on the Geneva rotor .l i,and timed to open the valve 44 just prior to the positioning of therotor ready for indexing the mold carrier.

Thus in operation of the device as the rotor I l is rotated to aposition ready for indexing, or mold carrier operation the cam 46 liftsthe valve stem 45 to open the valve 44. In this position, if all of themovable elements or mechanism I! have been fully returned to theirinoperative position, there will notbe any air pressure in line 35 asthe respective valves 28 are closed and hence there will be no operationof the piston 31 and interruption in the driving mechanism for the moldcarrier. If, however, at such moment, one of the elements I? is stuck inits lowered position or has not fully returned to its inoperativeposition, the valve head 37! being unseated, will allow'air underpressure to flow through line 35 through raised valve 44 to cylinder 36to actuate the piston 31 and disengage the clutch. When the defectiveelement H has been restored to its inoperative position, the valve head32 engages the seat 33 and shuts ofi the supply of pressure air fromline 34 and 35 permitting air in lines 35 and 35 to exhaust throughexhaust ports 39, permitting the automatic shifting of the clutch leverI4, by suitable means, as for example, a spring 40, and the reclutchingof the mold carrier driving mechanism. During the open position of thevalve 32 an enlarged portion of the valve stem closes the exhaust ports39 so that full air pressure is available for the actuation of piston 31to disengage the clutch and apply the brake 15.

It is to be understood that the construction above described and shownin the accompanying drawing is intended for illustrative purposes onlyand that many changes and variations may be made without departing fromthe spirit of my invention.

This application is a continuation of my application Serial No.661,915,filed March 21, 1933.

I claim:

1. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently moving said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means for actuating said clutch, and valve meansmounted adjacent said movable device and operable thereby during eachmovement of the device toward a mold, for controlling the operation ofsaid pneumatically operated clutch actuating means.

luble mold carrier, power means including a clutch for intermittentlymoving said carrier to present the molds successively to a stationaryworking position, a movable device mounted adjacent said mold at saidstationary working position, means for moving said device toward andfrom said mold, pneumatically operated means for actuating said clutch,valve means mounted adjacent said movable device and operable therebyduring movement of the device toward a mold, for controlling theoperation of said pneumatically operated clutch actuating means, andmeans connected to said valve means and pneumatically operated clutchactuating means for preventing actuation of the clutch except at timespreparatory to the movement of the mold carrier.

3. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently moving said carrier to airconnections between said valve and pneumatically operated clutchactuating means, said valve being arranged to admit air under pressurethrough said connection to said clutch actuating means upon being openedby said actuating member, while said device is in cooperative workingposition with a mold.

4. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently moving said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means actuating said clutch, a valve actuatingcam carried by and movable with said movable device, a valve arranged tobe operated by said cam during all times when the device is moved towardand in cooperative working position with respect to the mold, airconnections between said valve and clutch actuating means, and means forsupplying constant air pressure to said valve, said valve when openedbeing arranged to admit air under pressure through said connections tosaid clutch actuating means.

5. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently indexing said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means for actuating said clutch, a valveactuating memmer carried by said movable device, a valve mountedadjacent said device and arranged to be actuated by said member to openposition, air connections between said valve and pneumatically operatedclutch actuating means, said valve being arranged to admit air underpressure through said connections to said clutch actuating means uponbeing opened by said actuating member, and means interposed in said airconnections for interrupting the flow of air to said clutch 2. In aglassworking machine including a revo- 1y operated clutch actuatingmeans, said valve actuating means except at times preparatory to v theindexing movement of the mold carrier.

6. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently indexing said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means for actuating said clutch, a valveactuating member carried by said movable device, a valve mountedadjacent said device and arranged to be actuated by said member, to openposition, air connections between said valve and pneumatically operatedclutch actuating means, said valve being arranged to admit -air underpressure through said connection to said clutch actuating means uponbeing opened by said actuating member, andmeans interposed in saidconnections for interrupting the flow of air to said clutch actuatingmeans except when the valve is opened at a time preparatory to theindexing movement of the mold carrier.

7. In aglassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently, indexing said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumaticallyoperated means for actuating said clutch, a valve actuatingmember carried by said movable device, a valve mounted adjacent saiddevice and arranged to be actuated by said member to open position, airconnections between said valve and pneumatically operated clutchactuating means, said valve being arranged to admit air under pressurethrough said connections to said clutch actuating means upon beingopened by said actuating member, and a spring-pressed valve interposedin said connections for interrupting the flow of air to Said clutchactuating means except when the valve is opened at a time preparatory tothe indexing movement of the mold carrier.

8. In a glassworking machine including a revoluble mold carrier, power'means including a clutch for intermittently indexing said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means for actuating said clutch, a valveactuating member carried by said movable device, a valve mountedadjacent said device and arranged to be actuated by said member to openposition, air connections between said valve and pneumaticalbeingarranged to admit air under pressure through said connections to saidclutch actuating means upon being opened by said actuating member, valvemeans interposed in said air connections and arranged normally tointerrupt the flow of air under pressure to said clutch actuating means,and means for opening said last named valve means preparatory to anindexing movement of the mold carrier; 7

9. In a glassworking machine including a revoluble mold carrier, powermeans including a clutch for intermittently indexing said carrier topresent the molds successively to a stationary working position, amovable device mounted adjacent said mold at said stationary workingposition, means for moving said device toward and from said mold,pneumatically operated means for actuating said clutch, a valveactuating member carried by said movable device, a valve mountedadjacent said device and arranged to be actuated-by said member, to openposition, air connections between said valve and pneumatically operatedclutch actuating means, said valve being arranged to admit air underpressure through said connection to said clutch actuating means uponbeing opened by said actuating member, valve means interposed in saidair connections and arranged normally to interrupt the flow of air underpressure to said clutch actuating means, and a timer operating insynchronism with said mold moving means for opening said last namedvalve means preparatory to an indexing movement of the mold carrier.

10. In a glassware forming machine in combination with a mold carrier,and means for intermittently moving said mold carrier to present themolds thereon successively to a stationary working position, said meansincluding a clutch and a constantly rotating part, a movable device atthe stationary working position and means for moving said device towardand away from the mold, of pneumatically operated means for actuatingsaid clutch, a normally closed valve mounted adjacent said movabledevice and actuated thereby to open position when said device is movedtoward a mold, means for supplying air under pressure to said valve, andair connections between said valve and clutch actuating means forconducting air under pressure to the latter when the valve is opened bysaid movable device, a normally closed valve in said air connections forinterrupting the flow of air under pressure therein to said clutchactuating means, and means controlled by said constantly rotating partfor opening said last named valve preparatory to an indexing movement ofsaid mold carrier.

EDWARD MILLER.

